Novel heat-insulation fireproof porous concrete and preparation method thereof

A technology of porous concrete and thermal insulation, applied in the field of building fireproof materials, can solve the problems of cracking, low strength, water absorption, etc.

Inactive Publication Date: 2014-10-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Porous concrete is a new type of energy-saving and environmentally friendly building material. Although scholars at home and abroad have done a lot of research and development on it, making it widely used in wall materials, it still has certain defects, such as low strength and cracking. , water absorption, etc. Therefore, in order to further expand its application field, it is necessary to do further research on foaming agent, mixing ratio, process flow, equipment, etc.

Method used

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  • Novel heat-insulation fireproof porous concrete and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: the influence of fly ash content on foamed concrete performance

[0031] By adding different amounts of fly ash to the porous concrete, the compressive strength of the porous concrete mixed with fly ash is greatly lower than that of pure cement porous concrete, while the strength of the fly ash porous concrete is significantly improved after adding chemical activators. Increase. By testing the strength of concrete after 28 days, the effect of fly ash on its strength is determined. The specific process is as follows:

[0032]Add water to 42.5MPa ordinary Portland cement (the water-cement ratio is 1:0.5), add different proportions of 0, 10%, 20%, 30%, 40% fly ash and corresponding chemical activators, add 0.6 % organic fiber and 5% expanded perlite are stirred evenly to obtain cement-based slurry, 2% foaming agent solution is added, and the foaming agent solution is made into foam by a foaming machine. Mix the foam and cement-based slurry evenly to obtain...

Embodiment 2

[0034] Example 2: Effect of expanded perlite particles on porous concrete

[0035] Add water to 42.5MPa ordinary Portland cement (the water-cement ratio is 1:0.5), add 20% fly ash and the corresponding chemical activator, add 0.6% organic fiber, add different proportions of 0, 5%, 10 %, 15% of the expanded perlite is stirred evenly to obtain a cement-based slurry, and two foaming agent solutions of 2% and 5% are added, and the foaming agent solution is made into foam by a foaming machine. Mix the foam and cement-based slurry evenly to obtain a porous concrete slurry. The foam slurry is poured into a standard test mold of 100mm×100mm×100mm, and the curing room temperature is 26°C±2°C. After standing for 8 hours, the formwork is removed. Spray water to the test block once a day. After 28 days, put the test block into an 85°C drying oven to dry to constant weight, and measure its density and strength. A total of 2 groups of 6 pieces were made for each batch of test pieces. After...

Embodiment 3

[0037] Embodiment 3: the impact of different content organic fibers on porous concrete

[0038] Add water to 42.5MPa ordinary Portland cement (the water-cement ratio is 1:0.5), add 20% of fly ash and corresponding chemical activators, add 15% of expanded perlite, and add 0.4% of different proportions , 0.6%, 0.8%, 1.0% of the organic fibers are stirred evenly to obtain cement-based slurry, add 2% foaming agent solution, and use a foaming machine to make the foaming agent solution into foam. Mix the foam and cement-based slurry evenly to obtain a porous concrete slurry. The foam slurry is poured into a standard test mold of 100mm×100mm×100mm, and the curing room temperature is 26°C±2°C. After standing for 8 hours, the formwork is removed. Spray water to the test block once a day. After 28 days, put the test block into an 85°C drying oven to dry to constant weight, and measure its density and strength. A total of 2 groups of 6 pieces were made for each batch of test pieces. Aft...

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Abstract

The invention relates to a novel heat-insulation fireproof porous concrete and a preparation method thereof. The novel heat-insulation fireproof porous concrete has the characteristics of porous property, light weight, low heat conduction coefficient, high strength, good heat insulation effect and high temperature resistance, and belongs to the technical field of fireproof building materials. The novel heat-insulation fireproof porous concrete uses a large amount of industrial waste residue, accords with energy saving and environmental protection requirements, and is deeply and widely concerned in the building industry. Porous concrete with the density of 450-600Kg/m<3> and the anti-compression ability reaching 10MPa is prepared through using Portland cement as a binder, using fly ash and expanded perlite to substitute sand and parts of cement and adding a polypropylene fiber. High-strength porous concrete with the density of 600-800Kg/m<3> and the anti-compression ability reaching 20-30MPa is prepared by adopting an expanded perlite and polypropylene fiber doping technology. Porous concrete prepared by using cement, fly ash, an organic fiber and a self-made composite foaming agent has flow state characteristics, can be conveniently casted in mass, has a heat conduction coefficient of below 0.06J/K.M and a water absorption rate of below 10%, and provides technical support for the preparation of high-performance porous concrete heat insulation wall materials.

Description

Technical field: [0001] The invention relates to a novel thermal insulation and fireproof porous concrete and a preparation method thereof. The porous concrete has the characteristics of porous light weight, low thermal conductivity, high strength and good heat insulation effect, and belongs to the technical field of building fireproof materials. Background technique: [0002] With the rapid development of urbanization and the increasing number of high-rise buildings, the requirements and standards for building energy conservation are also constantly improving. This new situation also has new requirements for the development of my country's external wall insulation materials. How to promote the realization of building energy-saving goals while taking into account the fire safety of external thermal insulation systems has become a hot spot and focus of attention in the building thermal insulation industry and the whole society. [0003] Due to the functions of light weight, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B28/04C04B14/18C04B18/08C04B16/06C04B111/28
CPCY02W30/91
Inventor 李小超李妍黄朝晖房明浩刘艳改吴小文
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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